Design of compact off-axis three-mirror freeform optical system with small F number

Mo Ning; Xianglong Mao; Jiadong Yu; Ying Yuan; Jiating Yang; Zhaohan Cai; Yongjun Xie

doi:10.1117/12.3007600

18 December 2023 Design of compact off-axis three-mirror freeform optical system with small F number

Mo Ning, Xianglong Mao, Jiadong Yu, Ying Yuan, Jiating Yang, Zhaohan Cai, Yongjun Xie

Proceedings Volume 12964, AOPC 2023: Optical Design and Manufacturing ; 129640E (2023) https://doi.org/10.1117/12.3007600
Event: Applied Optics and Photonics China 2023 (AOPC2023), 2023, Beijing, China

Abstract

In the field of space optics, the compact freeform optical imaging system with small F number can realize the miniaturization and lightweight of the load, which is beneficial to enhance the ability of target recognition. In this paper, according to the vector aberration theory and the principle of Gaussian brackets, the error evaluation function is constructed by the primary wave aberration coefficients and focal length constraint of the system, and the dynamic weight is used to limit difference in the order of magnitude between various aberrations, which is conducive to rapid convergence in the process of solving the initial structural parameters. In order to achieve the compactness of the system, the circular layout is adopted. The unobstructed initial structure of the off-axis reflective system with conic surfaces is obtained through Particle Swarm Optimization (PSO) algorithm, and the off-axis three-mirror freeform optical system with a highly compact layout is obtained after optimization. In addition, considering the difficulty of freeform surfaces manufacturing, add the manufacturability constraint to the optimization process to control the degree of departure between the aperture edge of the freeform surfaces and the conic surfaces in real time. Compared with the optical system obtained without manufacturability constraints, the difficulty of manufacturing is effectively reduced.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Mo Ning, Xianglong Mao, Jiadong Yu, Ying Yuan, Jiating Yang, Zhaohan Cai, and Yongjun Xie "Design of compact off-axis three-mirror freeform optical system with small F number", Proc. SPIE 12964, AOPC 2023: Optical Design and Manufacturing , 129640E (18 December 2023); https://doi.org/10.1117/12.3007600

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KEYWORDS

Mirrors

Design and modelling

Particle swarm optimization

Ray tracing

Imaging systems

Monochromatic aberrations

Optical surfaces

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